I am going to have a mental breakdown over meringue

1/2 cup of egg whites and 1tsp cream of tartar. The egg whites are room temperature. I washed, dried, and then rinsed the mixer and bowl with vinegar and dried again. I can’t get them to stiffen. I’ve tried a kitchen aid, a hand mixer, and an immersion blender 😩
I have spent hours trying this. I’ve started over several times